<template>
  <div>
    <!-- 评论列表 -->
    <div
      class="cmt-list"
      :class="isShowCmtBox ? 'art-cmt-container-1' : 'art-cmt-container-2'"
    >
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多评论了，请发表评论"
        @load="onLoad"
        :immediate-check="false"
      >
        <!-- 评论的 Item 项 -->
        <div class="cmt-item" v-for="item in commentList" :key="item.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <img :src="item.aut_photo" alt="" class="avatar" />
              <span class="uname">{{ item.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                name="like"
                size="16"
                color="red"
                v-if="item.is_liking"
                @click="likeFn(true, item)"
              />
              <van-icon
                name="like-o"
                size="16"
                color="gray"
                v-else
                @click="likeFn(false, item)"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body">
            {{ item.content }}
          </div>
          <!-- 尾部区域 -->
          <div class="cmt-footer">{{ timeAgo(item.pubdate) }}</div>
        </div>
      </van-list>
    </div>

    <!-- 发表评论容器 -->
    <div>
      <!-- 底部添加评论区域 - 1 -->
      <div class="add-cmt-box van-hairline--top" v-if="isShowCmtBox == true">
        <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
        <div class="ipt-cmt-div" @click="toggleIsShowFn">发表评论</div>
        <div class="icon-box">
          <van-badge :content="totalCount == 0 ? '' : totalCount" max="99">
            <van-icon
              name="comment-o"
              size="0.53333334rem"
              @click="commentClickFn"
            />
          </van-badge>
          <van-icon name="star-o" size="0.53333334rem" />
          <van-icon name="share-o" size="0.53333334rem" />
        </div>
      </div>

      <!-- 底部添加评论区域 - 2 -->
      <div class="cmt-box van-hairline--top" v-else>
        <textarea
          v-fofo
          placeholder="友善评论、理性发言、阳光心灵"
          @blur="blurFn"
          v-model="cmtText"
        ></textarea>
        <van-button type="default" :disabled="!cmtText" @click="sendFn"
          >发布</van-button
        >
      </div>
    </div>
  </div>
</template>

<script>
import {
  commentListAPI,
  commentLikeAPI,
  commentDisLikeAPI,
  commentSendAPI,
} from "@/api";
import { timeAgo } from "@/utils/date";
export default {
  data() {
    return {
      offset: null,
      commentList: [],
      totalCount: "",
      isShowCmtBox: true,
      cmtText: "",
      loading: false,
      finished: false,
      lastId: "",
    };
  },
  created() {
    this.getCommentListFn();
  },
  methods: {
    async getCommentListFn() {
      const res = await commentListAPI({
        id: this.$route.query.art_id,
      });

      this.commentList = res.data.data.results;
      this.totalCount = res.data.data.total_count;
      this.lastId = res.data.data.last_id;

      if (res.data.data.results.length == 0) {
        this.finished = true;
      }
    },
    timeAgo,
    //评论点赞与取消点赞
    async likeFn(bool, item) {
      if (bool == true) {
        //点在红心上，取消点赞
        // item.is_liking = false;
        await commentDisLikeAPI({ id: item.com_id });
        this.getCommentListFn();
      } else {
        //点在灰心上，点赞评论
        // item.is_liking = true;
        await commentLikeAPI({
          id: item.com_id,
        });
        this.getCommentListFn();
      }
    },
    toggleIsShowFn() {
      this.isShowCmtBox = false;
    },
    commentClickFn() {
      document.querySelector(".like-box").scrollIntoView({
        behavior: "smooth",
      });
    },
    blurFn() {
      //问题：点击发布按钮，发现点击事件不执行-排除代码问题
      //原因：高的评论容器-在页面点击发布一瞬间，输入   框失去了焦点，被v-if和v-else排除了整个标签
      //导致点击事件没来的及执行
      //解决：失去焦点时，变量值，在最后再执行
      setTimeout(() => {
        this.isShowCmtBox = true;
      }, 0);
    },
    //发布评论
    async sendFn() {
      const res = await commentSendAPI({
        id: this.$route.query.art_id,
        text: this.cmtText,
      });
      this.commentList.unshift(res.data.data.new_obj);
      this.totalCount++;
      this.cmtText = "";
      this.commentClickFn();
    },
    //加载更多分页
    async onLoad() {
      if (this.commentList.length > 0) {
        const res = await commentListAPI({
          id: this.$route.query.art_id,
          offset: this.lastId,
        });

        this.commentList = [...this.commentList, ...res.data.data.results];
        this.totalCount = res.data.data.total_count;
        this.lastId = res.data.data.last_id;

        if (this.lastId == null) {
          this.finished = true;
        }
        this.loading = false;
      } else {
        this.loading = false;
      }
    },
  },
};
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}

/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
